Selling multiple secrets to a single buyer

This paper deals with the original work due to Brassard et al., in which an algorithm to sell only one secret to one buyer was introduced. It is based on the theory of quadratic residues modulo an integer number and Jacobi symbols. Unfortunately, this algorithm exhibits an important security drawback: the seller can disclose more than one secret to the buyer instead of only one. This problem was overcome by other sophisticated protocols. Although such problem has been satisfactorily tackled, the main goal of this work is to modify the original work (preserving its flavour) in order to securely disclose multiple secrets without the participation of more buyers but with a third trusted party.